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[Accommodation function and its clinical evaluation]
1Department of Ophthalmology, Fukushima Medical College, Japan.
Nippon Ganka Gakkai Zasshi
|December 1, 1994
Summary
A new accommodometer precisely measures clear vision response times, revealing faster accommodation in healthy individuals (under 0.5s) compared to diabetics or pseudophakia patients. This tool enhances objective visual assessment.
Area of Science:
- Ophthalmology and Vision Science
- Biomedical Instrumentation
- Human Physiology
Context:
- Subjective visual examinations for accommodation suffer from self-selection bias and poor time control.
- Objective assessment of clear vision and subject consciousness during tests is challenging.
- Existing instruments like the accommodopolyrecorder show scattered response times.
Purpose:
- To develop a novel instrument, the 'new accommodometer,' for precise measurement of clear vision time limits.
- To objectively measure accommodation response times during constriction and relaxation.
- To analyze accommodative response patterns and factors influencing clear vision.
Summary:
- The new accommodometer measured clear vision acquisition in young healthy subjects within 0.5 seconds, significantly faster than the accommodopolyrecorder (>0.8s).
- Diabetic patients and those with pseudophakia using bifocal lenses showed increased clear vision times (>0.6s).
- Analysis using an infrared optometer revealed rapid accommodative clear vision post-latent period, typically under 4D stimulus.
Impact:
- The new accommodometer offers improved objective measurement of visual accommodation, aiding in diagnosing and understanding visual impairments.
- Findings highlight the impact of conditions like diabetes and pseudophakia on accommodation speed and quality.
- The study provides insights into the dynamics of accommodative clear vision, relevant for optical correction and lens design.